Response header manipulation via unvalidated webhook topic
Published May 11, 2026 · Updated May 11, 2026
HTTP header injection in Webhook APIs in affected WSO2 API products allows remote attackers to overwrite HTTP response headers. The webhook API handler copies a request-controlled topic into a response header without validating it against the API template's permitted topics. No authentication or user interaction is required; resulting header manipulation can alter cookies, caching, or security controls, but does not expose data or interrupt service.
Summary
What happened
HTTP header injection in Webhook APIs in affected WSO2 API products allows remote attackers to overwrite HTTP response headers. The webhook API handler copies a request-controlled topic into a response header without validating it against the API template's permitted topics. No authentication or user interaction is required; resulting header manipulation can alter cookies, caching, or security controls, but does not expose data or interrupt service.
The record
- CVE
- CVE-2025-8154
- Published
- May 11, 2026
- Updated
- May 11, 2026
- Vendor
- WSO2
- Product
- WSO2 Traffic Manager
- Classifications
- CWE-74, T1565.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 11, 2026CVE publishedPublication date reported by the CVE source.
- May 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.5.0 <4.5.0.19
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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